Aim This study identified the moderating role of the amount of caregiving tasks on relationships between dementia family caregivers’ characteristics (age, education, etc.) and outcomes (burden, etc.). Design A cross‐sectional analysis of surveyed data. Method A convenience sample of 369 family caregivers (151 males, 218 females) aged 20 years or older was recruited from 10 cities in the southern area of South Korea. Data were collected from November–December 2011. Measures of caregiver burden, perceived health status and emotional distress of caregivers related to the memory‐behaviour problems of the care recipient were used to assess the outcomes of family caregivers of older adults with dementia. Results The amount of caregiving tasks has a moderating effect on the relationships between caregivers’ characteristics (such as living with the recipient and duration of caregiving) and the caregiver burden. The interaction between the amount of caregiving tasks and status of living with recipient was significant in relation to the emotional distress of caregivers related to the memory‐behaviour problems of the care recipient with dementia; however, there was no effect of the amount of caregiving tasks on the relationships between caregivers’ characteristics and perceived health status. Conclusion The amount of caregiving tasks can have a moderating role in the caregiving stress model. Intervention programs need to be developed and implemented to reduce negative outcomes of family caregivers, particularly those living with older adults with dementia. 目标 本研究确定了护理任务数量对痴呆症家庭护理人员特征(年龄和教育等)与结果(负担等)之间关系的调节作用。 设计 对调查数据进行横断面分析。 方法 从韩国南部地区的10个城市招募了369名年龄在20岁或以上的家庭护理人员(其中包括151名男性和218名女性)作为便利样本。收集2011年11月至12月之间的数据。有关护理人员的护理负担、感知健康状况和与护理接受者的记忆行为问题相关的情绪困扰的测量被用于评估老年痴呆症患者家庭护理人员的结果。 结果 护理任务数量对护理人员特征(如与接受者一起生活和护理期间等)和负担之间的关系具有调节作用。与痴呆症患者的记忆行为问题相关的护理人员的情绪困扰与护理人员的数量和与受者的生活状态之间的相互作用是显着的;然而,护理任务数量对护理人员特征与健康状况之间的关系没有影响。 结论 护理任务数量可以在护理压力模型中起调节作用。需要制定和实施干预计划,以减少家庭护理人员的消极结果,特别是那些患有老年痴呆症的老年人而言。